src/liblzma/common/easy.c

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       easy.c
   4 /// \brief      Easy Stream encoder initialization
   5 //
   6 //  Copyright (C) 2008 Lasse Collin
   7 //
   8 //  This library is free software; you can redistribute it and/or
   9 //  modify it under the terms of the GNU Lesser General Public
  10 //  License as published by the Free Software Foundation; either
  11 //  version 2.1 of the License, or (at your option) any later version.
  12 //
  13 //  This library is distributed in the hope that it will be useful,
  14 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 //  Lesser General Public License for more details.
  17 //
  18 ///////////////////////////////////////////////////////////////////////////////
  19
  20 #include "stream_encoder.h"
  21
  22
  23 struct lzma_coder_s {
  24         lzma_next_coder stream_encoder;
  25
  26         /// We need to keep the filters array available in case
  27         /// LZMA_FULL_FLUSH is used.
  28         lzma_filter filters[5];
  29 };
  30
  31
  32 static bool
  33 easy_set_filters(lzma_filter *filters, uint32_t level)
  34 {
  35         bool error = false;
  36
  37         if (level == 0) {
  38                 // TODO FIXME Use Subblock or LZMA2 with no compression.
  39                 error = true;
  40
  41 #ifdef HAVE_ENCODER_LZMA2
  42         } else if (level <= 9) {
  43                 filters[0].id = LZMA_FILTER_LZMA2;
  44                 filters[0].options = (void *)(&lzma_preset_lzma[level - 1]);
  45                 filters[1].id = LZMA_VLI_UNKNOWN;
  46 #endif
  47
  48         } else {
  49                 error = true;
  50         }
  51
  52         return error;
  53 }
  54
  55
  56 static lzma_ret
  57 easy_encode(lzma_coder *coder, lzma_allocator *allocator,
  58                 const uint8_t *restrict in, size_t *restrict in_pos,
  59                 size_t in_size, uint8_t *restrict out,
  60                 size_t *restrict out_pos, size_t out_size, lzma_action action)
  61 {
  62         return coder->stream_encoder.code(
  63                         coder->stream_encoder.coder, allocator,
  64                         in, in_pos, in_size, out, out_pos, out_size, action);
  65 }
  66
  67
  68 static void
  69 easy_encoder_end(lzma_coder *coder, lzma_allocator *allocator)
  70 {
  71         lzma_next_end(&coder->stream_encoder, allocator);
  72         lzma_free(coder, allocator);
  73         return;
  74 }
  75
  76
  77 static lzma_ret
  78 easy_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
  79                 lzma_easy_level level)
  80 {
  81         lzma_next_coder_init(easy_encoder_init, next, allocator);
  82
  83         if (next->coder == NULL) {
  84                 next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
  85                 if (next->coder == NULL)
  86                         return LZMA_MEM_ERROR;
  87
  88                 next->code = &easy_encode;
  89                 next->end = &easy_encoder_end;
  90
  91                 next->coder->stream_encoder = LZMA_NEXT_CODER_INIT;
  92         }
  93
  94         if (easy_set_filters(next->coder->filters, level))
  95                 return LZMA_OPTIONS_ERROR;
  96
  97         return lzma_stream_encoder_init(&next->coder->stream_encoder,
  98                         allocator, next->coder->filters, LZMA_CHECK_CRC32);
  99 }
 100
 101
 102 extern LZMA_API lzma_ret
 103 lzma_easy_encoder(lzma_stream *strm, lzma_easy_level level)
 104 {
 105         lzma_next_strm_init(easy_encoder_init, strm, level);
 106
 107         strm->internal->supported_actions[LZMA_RUN] = true;
 108         strm->internal->supported_actions[LZMA_SYNC_FLUSH] = true;
 109         strm->internal->supported_actions[LZMA_FULL_FLUSH] = true;
 110         strm->internal->supported_actions[LZMA_FINISH] = true;
 111
 112         return LZMA_OK;
 113 }
 114
 115
 116 extern LZMA_API uint64_t
 117 lzma_easy_memory_usage(lzma_easy_level level)
 118 {
 119         lzma_filter filters[5];
 120         if (easy_set_filters(filters, level))
 121                 return UINT32_MAX;
 122
 123         return lzma_memusage_encoder(filters);
 124 }